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The Golden Gate Bridge is a suspension bridge spanning the Golden Gate strait, the one-mile-wide (1.6 km), one-point-seven-mile-long (2.7 km) channel between San Francisco Bay and the Pacific Ocean. The structure links the American city of San Francisco, California to Marin County, carrying both U.S. Route 101 and California State Route 1 across the strait. The bridge is one of the most internationally recognized symbols of San Francisco, California, and the United States. It opened in 1937 and was, until 1964, the longest suspension bridge main span in the world, at 4,200 feet (1,280 m).